[vsnet-grb-info 11339] GRB 111228A: Skynet/Dolomiti Optical Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12751
SUBJECT: GRB 111228A: Skynet/Dolomiti Optical Observations
DATE:    11/12/29 03:51:36 GMT
FROM:    Melissa Nysewander at UNC-Chapel Hill  <mnysewan at unc.edu>

M. Nysewander, J. Haislip, K. Ivarsen, A. LaCluyze, M. Maturi, D. Reichart, J. Moore, T. Cromartie, R. Egger, A. Foster, N. Frank, A. Oza, E. Speckhard, A.Trotter, and J. A. Crain report:

Skynet observed the field of GRB 111228A (Ukwatta et al., GCN 12737) with the 16" Dolomites Astronomical Observatory telescope (DAO) in Italy beginning 6.4 hrs after the burst, and lasting for one hour.

We detect the afterglow in g' (11 x 180s) and r' (7 x 180s) exposures.  Using ~20 SDSS field stars, we measure the OT to be g' = 19.4 +- 0.1 at 6.73 hours and r' = 19.3 +- 0.2 at 7.30 hours in stacked images.  The OT faded by r' ~ 0.1 mag from 7.15 to 7.41 hours.